Heat exchanger baffle seal



May 14, 1940. J; A. coY f 2.200.787

HEAT EXCHANGER BAFFLE SEAL Filed Jan. 27, 1939 3 Sheets-Sheet 1 2 *la l j if 5 umg/h A by INVENTOR J. A. COY

HEAT EXCHANGEF. BAFFLE SEAL May 14, 1 940.

Filed Jan. 27, 1939 a sheets-sheet 2 Josep/2 A by INVENTOR May 14, 1940. J. A. cov

HEAT EXCHANGEP. BAFFLE SEAL Filed Jan. 27, 1939 5 Sheets-Sheet 5 Jefe/v7 A 60g Patented May 14, 1940 UNITEDy STATES PATENT oFFicE 2,200,787 HEAT` EXCHANGER BAFFLE SEAL Joseph A. Coy, Tulsa, Okla. Application lJanuary 27, 19739, Serial No. 253,198 i 1 claim. y(c1. 257-239) The invention relates to baille seals for heat exchangers or' boilers, and has for its object to provide a device ofthis character whereby the opposite sides of .the baille plate are provided with laterally movable packing members for engaging the inner periphery of the shell of the heat exchanger for forming a seal between vthe edges of the baille plate and the shell. means in connection with the laterally movable packing means for extending or retracting the same when it is desired to seal the plate or to remove the plate withthe tube bundle forcleaning or repair purposes. l

A further object is to provide a baille plate sealing means formed from a resilient material, as

- distinguished from a metallic one, thereby preventing the adherence of the seal to the boiler shell incident to corrosion.

A further object is to provide longitudinally movable tensioning bars in channels in opposite sides of the baille plate for forcing packing strips outwardly and means for moving the tensioning bars in parallel relation tov the wall of the shell during their longitudinal movement.

A further object is to provide pivoted dogs within the channel having their free ends disposed in recesses in the tensioning bar for imparting a parallel outward movement to the vtensioning bars as they are forced inwardly or outwardly. Also to provide the tensioning bars with lugs extending through slots arcuate inrelation to the pivotal point of the pivoted members for additionally guiding the tensioning bars and maintaining the bars assembled in the channels.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawings, described and claimed, it being understood that changes in the precise embodiment of theA invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings:

Figure 1 is a vertical longitudinal sectional view through the heat exchanger. and baille plate.

Figure 2 is a horizontal sectional view through a part of the heat`exchanger taken on line 2--2 of Figure 3. l I

Figure 3 is a vertical transverse sectional view through the heat exchanger.

Figure 4 is an enlarged detail sectional view, vertically, through one side of the baille plate and a portion of the exchanger shell, showing the packing strip compressed.

Figure 5 is a horizontal sectional view through Also to provide one side ofthe exchanger shell, showing the packing means in voperative position.

Figure 6 is a detail perspective View of a porv tion of the packing means, parts being broken away to better show the structure.

Figure 7 is a detail perspective View of one corner of the baille plate, showing the operating means for one of the tensioning bars.

`Figure 8 is a horizontal sectional view on line 8-801' Figure 9, showing thev tensioning bar retracted.

Figure 9 is a detail sectionalview taken on line 9-4-9 of Figure 8. l Referring to the drawings, the numeral I designates the shell of a conventional form of heat exchanger, 2 the head thereof and 3 the `tube sheet in which are anchored the ends of v 3 vis a rhorizontally disposed baille plate 6 of lesswidth than the diameter of the chamber of the shell l, and adapted to be removed from theshell, or-placed therein along with the tube sheet 3.

Heretofore baille sealing means has included the engagement of metal with metal, and it has been found, incident to corrosion, that the baffle plates can not be easily removed, and it often becomes necessary for workmen to go into` the shellto break this adhesion so the baille can be removed. To obviate this difficulty applicant provides resilient packing strips 1 for engaging the inner periphery .8 of the shell, hence said strips do not corrode to the shell, and if there is any sticking or cohesion ofthe strips to the shell, the strips can be easily removed after the baille plate and tubing bundle have been removed from the shell.

Secured to opposite sides of the baille plate 6, by means of rivets 9, are outwardly extending plates ill) and in the channels formed by the plates, the movable parts are disposed. Longitudinally and laterally slidable between the plates Il) are tensioning bars H, which when forced outwardly engage metallic strips I2 forming a backer for each of the packing strips l. By providing the strips l2, it will be seen that when the tensioning bars are longitudinally and laterally moved the resilient packing strip will not bel buckled or distorted, as there is avsliding vengagement of the tensioning bars with the strips i2. The tensioning bars il are provided with oppositely disposed guide lugs I3, which are guidably mounted in arcuate slots i4 in the strips l0, clearly shown in Figures 2, 8, and 9. By providing the arcuate slots, it is obvious, when the hinged cam members I5 are rotated outwardly on their hinging points I6 to the positions shown in Figures 2 and 6, that the stripsII will be longitudinally and laterally moved in parallel relation to the boiler shell wall. It will be noted that the arcuate slots I4 are concentric with the pivotal points I 6, hence will not interfere with the movement of the bars'II, inwardly or outwardly. It will be noted however that the lugs I3, within the slots III, will maintainthe parts assembled during the handling of the device, for instance when renewing a tube bundle or removing the bundle from the boiler shell.

The cams I5 are disposed within recesses Il in the edge of the baie plate and are limited in their movement towards open position ,Y by. the

lll)

shoulders I8 of said recesses.` The other ends of the cams I5 extend into recesses-I9 in the tensioning bars, and it will be seen that whenk they tensioning bars are longitudinally moved' to the position shown in Figure 6, thebarswill be forced outwardly in sliding engagement with the strips I2 and the I resilient packing strip I will `be compressed against theV wall of the boiler shell.

The recesses I9'are`also provided with shoulders 20, substantially parallel to the shoulders I8 for limiting the extreme movement of the cams, however it Will be noted that the recesses I'I are rounded at one side and the cams preventedfrom passing beyond a right angle `position.

One end of each of the tensioning bars IIIis provided with a threaded extension ZI, which threaded extensions extend through elongated apertures 22 in a bracket 24 carried by one end of the exchanger shell as clearly shown in Figures 5 and '7. Threaded on the extensions `2l and on opposite sides of the brackets 24 are adjusting nuts 25. It will be seen that when the inner adjusting nut 25 is threaded outwardly on `the extension 2|, the tensioning strip II in Figure 5 will be moved from the dotted line position shown to the full line position, and after a tight connection has been made between the inner' periphery of the shell and the baffle plate the outer nuts 25 are tlghtenedfor preventing retrograde movement.

From the above it will be seen that aballle` plate packing device is provided which may be easily assembled within the boiler along with the tube bundle, and after the tube sheet 3 is in position the packing strips can be manpulated outwardly from the other end of the shell. It will also be seen that when it is desired to repair a tube or remove the tube bundle, it will only be necessaryto move the tensioning bars II to inoperative positions, as shown in Fig- .I'ure 8 and then the baffle plate can be removed from the shell along with the tube bundle. It

f is obvious that by assembling the parts between the 'plates II),'the-working parts are positively held against `disassembling when `the device is placed in or removed' from the shell. If the resilient' packing strip l should adhere to the Walll of the shell, it can be easily pulled or scraped therefrom, rwhich is not` true'wher'e a metallic strip has corroded tothe shell. Y l

The. invention having been set forth what is claimed as new and useful is:k f v The combination with a heat exchanger baille v plate carried by a tubesheet and disposed between tubes carried by the tube sheet, of packing members disposed in channels in the edges of A the baille plate,l tensioning bars longitudinally and laterally movable Withinv the channels, hinged cam arms within the channelsand coop- Y erating with the tensioning bars for forcingthem outwardly upon longitudinal ymovement there--V of in one direction, the inner ends of said arms being rockably mounted in semicircular recesses inthe edges of the plate, the outer. ends of said arms being rockably mounted in semicircular shaped recesses in the bars and tangentially disposed shouldersv carried by the recesses of the l plate and bars on opposite sides of the arms and forming means for limiting the pivotalaction of the arms uponmovement of the bars in one direction. p Y f JOSEPHA. COY. 

